Warmer temps=better performance

[JeepJeepster]

Im just wondering if anyone ever noticed how much better their kj performs when the temps start to go up? Since Im in school and live on campus, I usually only drive my Jeep once a week. Because I do this, I can notice major differences from one week to the next depending on the temp.

Back when it was 20-30F, my Jeep struggled to get 17mpg or better(according to the evic) at hw speeds of 70mph+. Yesterday it was a nice 60F and I could easily hold 75-80mph and the evic constantly said 21mpg. I also noticed it had alot more low end torque and could easily hold 4th-locked on some bigger hills without unlocking or downshifting.

Just wondering if anyone else ever notices this. Its amazing how much more friction the drivetrain has when its cold out. Also, I know Im not actually getting 21mpg but it tells me its getting better mpg then in the winter. The evic is usually off by 1-2mpg if I figure it by hand.

 

[JIMMY JEEP]

Ive noticed that recently round town my mpg has got a lot better since the weather warmed a few degrees,or it could be the 345psi i put in my tyres.

 

[timmer]

345 psi? WOW!

I've seen a marked increase in MPG during spring and fall and a decrease during winter (cold rain) and summer (tropical rain forest).

I currently average 22 MPG on the HWY in my 4X2. My 02 has 106K (miles) on the clock now and I swear I'd put it against any of the Jeeps here as far as comfort (leather) smoothness of ride and agility (OK, maybe not so much there).

I was at the dealership last week and picked up a GC Overland Edition brochure. I want one so bad I can taste it. The problem is, this KJ is paid for and I refuse to go into debt when I am almost totally debt free.

Oh well, c'est la vie.

 

[KeswickDave]

I've noticed the same thing, in most of my vehicles over the years in our Canadian seasons. Something in the range of 15-20% better fuel economy in the summer months.

Although, I can't say I've noticed a "performance" difference. I always thought that winter up here was like having a "cold air intake" without actually having to pay for one

Dave

 

[VTNomad]

Cold weather

The pressure in your tires will drop with the temperature, increasing your rolling resistance and decreasing mpg's. Also, switch to a lighter weight oil. I use 5W20 in the winter as opposed to 5W30 in the summer.

 

[hyde]

Yeah, I can't say it performs better in warmer weather, but it is definitely "softer", quieter and smoother. The reason I won't say it performs better because on the highway it is always more difficult to speed up since like Blake said it won't downshift so quickly. The difference most obvious when I start up in the morning and take that slight hill to work on my first mile, on cold weather if feels like I am towing!
But I am glad someone else noticed the same thing I did.

 

[Dave]

Although, I can't say I've noticed a "performance" difference. I always thought that winter up here was like having a "cold air intake" without actually having to pay for one

Dave

It warms up quicker in warmer weather so you can get a feeling of a performance difference I guess. I notice an enormous difference in cold weather performance when it has been in the garage all night than when I leave it outside.

Your "free cold air intake" is not free really. You pay for it in less mpg and heating your house in cold weather......sorry if I burst your bubble.

Dave

 

[2003KJ]

And also don't forget that as winter ends, so do the additives that are put into the fuel for winter months, which usually equate to lower mpg's.